Be careful using the 6146B/8298A or the 6146W tubes in the AF-67. Those versions are much harder to neutralize in equipment designed for the 6146 or 6146A/8298. Many of the older transmitters are very unhappy with the 6146B/8298 or 6146W tubes. I have run into like 3-different transmitters, of exactly the same model, with serial numbers very close, in which 1 of the transmitters had no problems, at all, with the 6146B/8298A and the other 2 had all sorts of problems. The 6293 is an excellent replacement for the transmitters designed for using the earlier versions. It basically is a 6146A/8298 with a heavier plate. That tube was used as a pulse modulator with inputs up to 1000-watts! When run under the same operating conditions as the 6146 or 6146A/8298, the 6293 generally lasts between 5-times, and 10-times, more length of time than the other tubes. Glen, K9STH
Website: http://k9sth.net From: "[email protected]" <[email protected]> To: BOATANCHORS <[email protected]>; Florida boatanchors <[email protected]> Sent: Friday, December 12, 2014 12:34 PM Subject: [Boatanchors] Which 6146 in AF-67? Which version of the 6146-series will provide the most reliable & stable service in an AF-67, please? Does the tube selected matter if operating variable-carrier DSB (a modification to provide SSB-friendly and AM output) or as-designed plate-modulated AM? _______________________________________________ Boatanchors mailing list [email protected] https://puck.nether.net/mailman/listinfo/boatanchors
